Xiaomi may have been talking a lot about the cameras on its new 15 Ultra phone at this year's Mobile World Congress, but it had another bit of mobile camera tech up its sleeves. In essence, it's a camera unit that attaches to the back of a phone,

If you hate the big camera bump of today's smartphones, you'll love the detachable lens of Xiaomi’s Modular Optical System.

Xiaomi is showing off its new concept idea for the Xiaomi Optical Modular System – a micro four-thirds camera and lens combo that magnetically attaches to the rear of a prototype Xiaomi 15. The system contains a 100MP Micro Four Thirds sensor,